Shengjiang C.,Ningde Teachers College |
Weichuan L.,Fujian Normal University
Acta Mathematica Scientia | Year: 2011
In this article, we deal with the uniqueness problems on meromorphic functions sharing two finite sets in an angular domain instead of the whole plane C. In particular, we investigate the uniqueness for meromorphic functions of infinite order in an angular domain and obtain some results. Moreover, examples show that the conditions in theorems are necessary. © 2011 Wuhan Institute of Physics and Mathematics.
Zheng L.,Fujian Normal University |
Lin M.,Fujian Normal University |
Huang Y.,Fujian Normal University |
Yan G.,Fujian Normal University |
And 4 more authors.
China Petroleum Processing and Petrochemical Technology | Year: 2013
The strontium modified waste FCC catalyst was prepared by magnetic stirring method and characterized by Xray diffractometry (XRD), UV-Vis diffuse reflectance spectrometry (DRS), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Meanwhile, its photocatalytic denitrogenation performance was evaluated in terms of its ability to degrade the N-containing simulation oil under visible light. A mixture of strontium nitrate solution (with a concentration of 0.5 mollL) and waste FCC catalyst was calcined at 400 0 for 5 h prior to taking part in the photocatalytic denitrogenation reaction. The test results showed that the photocatalytic degradation rate of pyridine contained in simulation oil in the presence of the strontium modified FCC catalyst could reach 92.0% under visible light irradiation for 2.5 h. waste FCC catalyst; photocatalysis; denitrogenation.
Lu C.-Y.,Fujian Normal University |
Chen Z.,Fujian Normal University |
Chen Z.,Ningde Teachers College |
Han H.-C.,Fujian Normal University |
And 3 more authors.
Chinese Journal of Inorganic Chemistry | Year: 2010
This work investigates the fabrication of the ultrafine fibers by polyvinylpyrrolidone (PVP) sol/titanium n-butyloxide (Ti(OC 4H 9) 4) using the electrospinning technique. The bicomponent fibers of PVP/Ti(OC 4H 9) 4 are heat treated at 200 °C and calcined at 550 °C. TiO 2 nanofibers with a diameter of 60∼300 nm were fabricated. Thin carbon films were deposited on the surface of the TiO 2 nanofibers by chemical vapor deposition (CVD). The morphological structure of the ultrafine fibers has been studied by means of infrared (FTIR) spectrum, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Comparing with TiO 2 nanofibers the carbon film deposited TiO 2 fibers exhibit higher photo-catalytic activity toward the degradation of methylene blue.
Zheng L.-P.,Fujian Normal University |
Li L.,Fujian Normal University |
Yan G.-Y.,Fujian Normal University |
Yan G.-Y.,Ningde Teachers College |
And 3 more authors.
Jiegou Huaxue | Year: 2013
Cu2O/TiO2 catalyst was prepared by the modification of TiO2 with Cu(NO3)2 through combined ultrasonic resonance and impregnation method. The samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption (BET), UV-vis diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS). The catalyst was used for photocatalysis denitrogenation of pyridine in an octane solution under visible light. Pyridine was taken as the probe molecule to study the denitrogenation property of Cu2O/TiO2. The best performance in the photocatalytic denitrogenation of model oil containing pyridine was 85% under the conditions of Cu loading concentration of 0.5 mol/L, calcination temperature of 400 °C and calcination time of 5 h. Copyright © 2008 Chinese Journal of Structural Chemistry.
Chen F.,Ningde Teachers College |
Xie X.,Ningde Teachers College |
Wang H.,Fuzhou University
Journal of Systems Science and Complexity | Year: 2015
A competition model of plankton allelopathy with infinite delay is considered in this paper. By using an iterative method, the global stability of the interior equilibrium point of the system is investigated. The result shows that for this system, delay and toxic substances are harmless for the stability of the interior equilibrium point. © 2015, Institute of Systems Science, Academy of Mathematics and Systems Science, CAS and Springer-Verlag Berlin Heidelberg.
Chen L.,Fujian Institute of Education |
Xie X.,Ningde Teachers College
Nonlinear Analysis: Real World Applications | Year: 2011
In this paper, we consider an N-species cooperation system with continuous time delays and feedback controls. By applying a new integral inequality, we obtain a set of sufficient conditions which ensure the permanence of the system. Our result shows that feedback control variables have no influence on the permanence of the system, thus improving the corresponding results of Chen, Liao and Huang [F.D. Chen, X.Y. Liao, Z.K. Huang, The dynamic behavior of N-species cooperation system with continuous time delays and feedback controls, Applied Mathematics and Computation 181 (2) (2006) 803815]. © 2010 Published by Elsevier Ltd. All rights reserved.
Zheng N.,Ningde Teachers College
Guangxue Xuebao/Acta Optica Sinica | Year: 2010
The squeezing properties of a two-mode field initially in a coherent state resonantly interacting with a three-level V-type atom are investigated by means of the quantum theory and numerical calculations. The dependence of the squeezing on the average photon number of the cavity mode, the coupling constant and the interaction time is discussed for three cases: 1) no state-selective atomic measurement; 2) direct state-selective atomic measurement; 3) state-selective atomic measurement after the application of a classical field. It is show that the squeezing increases with the average photon number of the two cavity mode, and it is greatly enhanced if the atom is state-selectively measured even for the case of low photon number. It is concluded that the maximal squeezing is approximately 75% for all the considered cases.
Zheng N.-Q.,Ningde Teachers College
Wuli Xuebao/Acta Physica Sinica | Year: 2010
Nonclassical properties of a two-mode field initially in an SU (2) coherent state resonantly interacting with a three-level Λ-type atom are investigated by means of the quantum theory and numerical calculations. The dependence of the nonclassical properties on the total photon number of the two-mode, the partition parameter and the coupling constant is discussed for three cases: (1) no state-selective atomic measurement; (2) direct state-selective atomic measurement; and (3) state-selective atomic measurement after the application of a classical field. The results indicate that when the total photon number of the two-mode is increased or the state-selective measurement is performed on the atom, the difference squeezing of two-mode is distinctly enhanced; and when the partition parameter is decreased or the state-selective measurement is performed on the atom after the application of a classical field, the average intensity of the sub-Poisson statistic distribution of mode a is reduced and that of mode b is enhanced; when the total photon number of the two modes is increased or the direct state-selective measurement is performed on the atom, the anti-correlation character between the two modes is preserved, but the average intensity of the anti-correlation is reduced; and when the direct state-selective measurement is performed on the atom, the Cauchy-Schwartz inequality is violated. ©2010 Chin.Phys.Soc.